Heat exchange system and water heater

Abstract

The utility model discloses a heat exchange system and a water heater, and the heat exchange system is used for being arranged in the water heater and comprises a heat exchanger which is connected with a water inlet pipe and a water outlet pipe; the flow valve comprises a valve body and a control part arranged on the valve body, the valve body comprises a first pipe body communicating with the water inlet pipe, a second pipe body communicating with the water outlet pipe and a bypass pipe body communicating the first pipe body with the second pipe body, and the control part is used for controlling the water passing flow of the bypass pipe body; the water inlet pipe, the heat exchanger, the water outlet pipe and the valve body form a circulation loop. And the circulating water pump is arranged in the circulating loop and is used for driving the water flow to flow along the circulating loop. According to the technical scheme, the anti-freezing problem of the water path component of the water heater in the severe cold environment in winter can be solved in a simpler, more efficient and low-cost mode, and the problem that water temperature fluctuates in the scene that water is turned off and then turned on can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a heat exchange system and a water heater. Background Art

[0002] When using gas water heaters in severe winter conditions, there is a risk of water circuit components freezing or cracking, which can affect normal use by users or cause property losses. Traditional water heater antifreeze solutions usually require the water circuit components inside the water heater to form a long circulation loop with the external circulation pipeline. The water in the entire pipeline must be preheated for a complete cycle to achieve the purpose of antifreeze for all water circuit components inside the water heater; the preheating time is long, the gas consumption is high, and the combustion and ignition noises generated when running in the early morning affect the user's rest.

[0003] In addition, when using a gas water heater, users usually turn off the water when applying shower gel or shampoo. In this scenario, because the water in the heat exchanger absorbs the residual heat in the cavity, the water temperature is higher than the user's set temperature. When the water is turned on for the second time, the user feels hot when bathing. At the same time, after the water is turned on for the second time, the water heater has a self-check and pre-cleaning sequence to ensure safe operation. During this sequence, the water heater has not been ignited for heating, and the cold water flows directly out through the heat exchanger, so the user feels cold when bathing. In the prior art, a bypass pipe is usually added to the inlet and outlet pipes of the heat exchanger to solve the temperature fluctuation of the hot feeling caused by the second use of boiling water. However, it can only solve the hot feeling problem, not the cold feeling problem, and at the same time brings problems such as high gasification noise, low efficiency and affecting the life of the heat exchanger. Utility Model Content

[0004] The main purpose of the utility model is to propose a heat exchange system, which aims to solve the problem of antifreeze of water circuit components of water heaters in severe winter conditions in a simpler, more efficient and low-cost way, while also solving the problem of water temperature fluctuations when the water is turned off and then on again.

[0005] To achieve the above-mentioned purpose, the heat exchange system proposed by the utility model is used to be arranged inside the water heater, and includes:

[0006] A heat exchanger, wherein the heat exchanger is connected with a water inlet pipe and a water outlet pipe;

[0007] A flow valve, comprising a valve body and a control component provided on the valve body, wherein the valve body comprises a first pipe body connected to the water inlet pipe, a second pipe body connected to the water outlet pipe, and a bypass pipe body connecting the first pipe body with the second pipe body, and the control component is used to control the water flow rate of the bypass pipe body; the water inlet pipe, the heat exchanger, the water outlet pipe and the valve body are connected to form a circulation loop; and

[0008] A circulating water pump is arranged in the circulating loop and is used to drive water to flow along the circulating loop.

[0009] In one of the embodiments, the heat exchange system further comprises a heating element disposed on the circulation loop, and the heating element is used to heat the water flow in the circulation loop.

[0010] In one embodiment, the heating element comprises an electric heater disposed on a water inlet pipe of the circulation loop.

[0011] In one embodiment, the control component is a solenoid valve or a proportional valve.

[0012] In one embodiment, the control component is disposed on a peripheral wall of the bypass tube body and is located between the first tube body and the second tube body.

[0013] In one embodiment, the water inlet pipe includes a first water inlet pipe section connecting the water inlet end of the first tube body with the water inlet joint, and a second water inlet pipe section connecting the water outlet end of the first tube body with the water inlet of the heat exchanger; the water outlet pipe includes a first water outlet pipe section connecting the water inlet end of the second tube body with the water outlet of the heat exchanger, and a second water outlet pipe section connecting the water outlet end of the second tube body with the water outlet joint; the first tube body, the second water inlet pipe section, the heat exchanger, the first water outlet pipe section, the second tube body, and the bypass tube body are connected end to end to form the circulation loop.

[0014] In one embodiment, the flow valve, the second water inlet pipe section, and the first water outlet pipe section are all located on the same side of the heat exchanger.

[0015] In one embodiment, the first tube body is connected to the water inlet end of the water inlet pipe, the second tube body is connected to the water outlet end of the water outlet pipe, the water inlet end of the first tube body is provided with a water inlet joint, and the water outlet end of the second tube body is provided with a water outlet joint.

[0016] The utility model also provides a water heater, comprising a shell and the above-mentioned heat exchange system arranged in the shell.

[0017] In one of the embodiments, a burner, a smoke hood and a fan are provided in the shell, and the burner and the smoke hood are respectively arranged on opposite sides of the heat exchanger; wherein the fan is a strong exhaust fan connected to the smoke hood; or the fan is a strong blower connected to the burner.

[0018] When the heat exchange system of the technical solution of the utility model is applied to a water heater, when the water heater is in a low temperature and severe cold environment, the water heater self-circulation mode is started, the flow valve of the heat exchange system is opened, the circulating water pump is started, and the circulating water pump drives the water flow to circulate in the circulation loop of the heat exchange system. At the same time, the burner of the water heater is ignited and burned to heat the water flow in the circulation loop. In this way, the water flow in the circulation loop will be quickly heated, thereby playing a role in preventing the water circuit components of the water heater from freezing. The circulation loop of the heat exchange system is built into the water heater, and the total length of the circulation loop is greatly reduced, so that the water content in the self-circulation path is much smaller than the water content in the external circulation pipeline. Therefore, the operating time required for the burner to start once to achieve the purpose of antifreeze is shorter, the gas consumption is lower, the antifreeze is more efficient, and the time that the antifreeze operation of the water heater interferes with the user is greatly shortened. In addition, the antifreeze solution is also suitable for users who have not installed a return valve, reducing the installation and use costs. When the water heater is in the scene of turning off the water and then turning it on again, the self-circulation mode of the water heater is activated, and the water in the heat exchanger flows out of the heat exchanger under the action of self-circulation, and no longer continuously absorbs the residual heat in the cavity, which can effectively reduce the "hot feeling" when it is turned on again; at the same time, after starting the self-circulation, the water flow in the burner heating circulation loop is started again. During the self-inspection and pre-cleaning sequence of the second water heater, the first water to flow out is the water flow that is self-circulated and heated by the inlet flow path, rather than the unheated cold water, so it can effectively reduce the "cold feeling" of the second water. In this way, the problem of water temperature fluctuation in the scene of turning off the water and then turning it on again can be well solved, avoiding the "hot feeling" and "cold feeling" of users during bathing, which can improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the cyclic preheating and antifreeze of the prior art solution;

[0021] Figure 2 This is a schematic structural diagram of an embodiment of a heat exchange system of the utility model;

[0022] Figure 3 This is a schematic structural diagram of another embodiment of the heat exchange system of the utility model;

[0023] Figure 4 This is a schematic structural diagram of the first embodiment of the water heater of the utility model;

[0024] Figure 5It is a structural schematic diagram of the second embodiment of the water heater of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the third embodiment of the water heater of the utility model;

[0026] Figure 7 It is a structural schematic diagram of a fourth embodiment of the water heater of the utility model;

[0027] Figure 8 It is a structural schematic diagram of an embodiment of a flow valve of a heat exchange system of the utility model.

[0028] Description of Figure Numbers:

[0029] Label name Label name 100 Water Heater 1412 Second tube body 10 Heat exchange system 1413 Bypass pipe body 11 Heat Exchanger 142 Control components 12 Water inlet pipe 15 Circulation pump 121 The first water inlet section 16 Heating element 122 Second water inlet section 20 case 13 Outlet pipe 30 Burner 131 The first outlet pipe section 40 Fume hood 132 The second outlet pipe section 50 Fan 14 Flow valve 60 Water inlet connector 141 Valve body 70 Water outlet connector 1411 first tube body 80 Air intake connector 100’ Water Heater 300’ Backwater valve 15’ Circulation pump 400’ Faucet 200’ External circulation pipeline 500’ Shower

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] When using gas water heaters in a cold winter environment, there is a risk of freezing or cracking of water path components, which may affect normal use of users or cause property losses. Figure 1 As shown, the water inlet pipe and the water outlet pipe of the water heater 100' are connected to the user's water use end (such as the faucet 400', the shower head 500', etc.) through the external circulation pipeline 200', and a return valve 300' is provided in the external circulation pipeline 200', and a circulating water pump 15' is provided inside the water heater 100', and the heat generated by the burner of the water heater 100' is used to circulate and preheat the water flow in the water heater 100' and the external circulation pipeline 200' to prevent freezing. The problems with this solution are: the water in the entire pipeline must be preheated for a complete cycle to achieve the purpose of preventing freezing of all water path components inside the water heater 100'; the preheating time is long, the gas consumption is high, and the combustion and ignition noises generated when running in the early morning affect the user's rest.

[0035] In addition, when using a gas water heater, users usually turn off the water when applying shower gel or shampoo. In this scenario, because the water in the heat exchanger absorbs the residual heat in the cavity, the water temperature is higher than the user's set temperature. When the water is turned on for the second time, the user feels hot when bathing. At the same time, after the water is turned on for the second time, the water heater has a self-check and pre-cleaning sequence to ensure safe operation. During this sequence, the water heater has not been ignited for heating, and the cold water flows directly out through the heat exchanger, so the user feels cold when bathing. In the prior art, a bypass pipe is usually added to the inlet and outlet pipes of the heat exchanger to solve the temperature fluctuation of the hot feeling caused by the second use of boiling water. However, it can only solve the hot feeling problem, not the cold feeling problem, and at the same time brings problems such as high gasification noise, low efficiency and affecting the life of the heat exchanger.

[0036] Based on this, the utility model proposes a heat exchange system 10, which can solve the antifreeze problem of the water path components of the water heater 100 in the severe cold environment in winter in a simpler, more efficient and low-cost way, and at the same time solve the problem of water temperature fluctuations when the water is turned off and then on again.

[0037] The heat exchange system 10 can be used in a water heater 100 or other hot water systems that need to realize a self-circulation function and a bypass water mixing function. The following mainly describes the application of the heat exchange system in a water heater 100 as an example. The water heater 100 is specifically described by taking a gas water heater 100 with a coil-free heat exchanger 11 as an example.

[0038] like Figures 4 to 7As shown, the water heater 100 includes a housing 20, and a heat exchange system 10, a burner 30, a smoke hood 40 and a fan 50 arranged in the housing 20. Among them, the burner 30 is arranged below the heat exchanger 11 of the heat exchange system 10. For a strong drum type gas water heater 100, the fan 50 is arranged below the burner 30; for a strong extraction type gas water heater 100, the fan 50 is arranged above the heat exchange system 10. When the water heater 100 is working, the fan 50 is started, and the mixture of gas and air enters the burner 30 for combustion, and the cold water in the external water supply system can enter the heat exchanger 11 of the heat exchange system 10 through the water inlet pipe 12. The high-temperature flue gas generated by the burner 30 flows upward to exchange heat with the heat exchange system 10 to heat the water in the heat exchanger 11. The heated hot water can be output to the user end through the water outlet pipe 13 to provide hot water for the user. The following mainly describes the specific implementation of the heat exchange system 10 by example.

[0039] Please refer to Figure 2 and Figure 4 In one embodiment of the utility model, the heat exchange system 10 is used to be arranged inside the water heater 100, and the heat exchange system 10 includes a heat exchanger 11, a flow valve 14 and a circulating water pump 15. The heat exchanger 11 is connected to a water inlet pipe 12 and a water outlet pipe 13; wherein the water inlet pipe 12 is connected to the water inlet of the heat exchanger 11, and the water outlet pipe 13 is connected to the water outlet of the heat exchanger 11. The flow valve 14 includes a valve body 141 and a control component 142 arranged on the valve body 141, the valve body 141 includes a first tube body 1411 connected to the water inlet pipe 12, a second tube body 1412 connected to the water outlet pipe 13, and a bypass tube body 1413 connecting the first tube body 1411 with the second tube body 1412, the control component 142 is used to control the water flow rate of the bypass tube body 1413; the water inlet pipe 12, the heat exchanger 11, the water outlet pipe 13 and the valve body 141 are connected to form a circulation loop; the circulating water pump 15 is arranged in the circulation loop, and is used to drive water to flow along the circulation loop.

[0040] The heat exchanger 11 may be a coilless heat exchanger or a coiled heat exchanger. Taking the coilless heat exchanger 11 as an example, the heat exchanger 11 may include a heat exchange tube and a heat exchange plate sleeved on the outer periphery of the heat exchange tube. The water inlet end of the heat exchange tube is connected to the water inlet pipe 12, and the water outlet end of the heat exchange tube is connected to the water outlet pipe 13. The water inlet end and the water outlet end of the heat exchange tube may be arranged on the same side of the heat exchanger 11 or may be arranged on both sides of the heat exchanger 11. The valve body 141 of the flow valve 14 is connected between the water inlet pipe 12 and the water outlet pipe 13.

[0041] The valve body 141 of the flow valve 14 is generally in an "H"-shaped structure, with the first tube body 1411 and the second tube body 1412 extending in parallel and arranged at intervals, and the two ends of the bypass tube body 1413 are respectively connected to the middle positions of the first tube body 1411 and the second tube body 1412. Among them, the first tube body 1411 can be connected in series to the middle position of the water inlet pipe 12, or it can be arranged at the water inlet end of the water inlet pipe 12; the second tube body 1412 can be connected in series to the middle position of the water outlet pipe 13, or it can be arranged at the water outlet end of the water outlet pipe 13. It can be understood that the first tube body 1411 has a first water inlet port and a first water outlet port at both ends, and the first water outlet port is connected to the water inlet of the heat exchanger 11 via the water inlet pipe 12; the second tube body 1412 has a second water inlet port and a second water outlet port at both ends, and the water outlet of the heat exchanger 11 is connected to the second water inlet port via the water outlet pipe 13. An inlet channel is formed inside the first tube body 1411, an outlet channel is formed inside the second tube body 1412, and a bypass channel is formed inside the bypass tube body 1413. The flow valve 14 adopts an H valve structure, which has a simple structure, is easy to manufacture, and has a small overall volume, and is suitable for installation inside the water heater 100. Among them, the valve body 141 can be an integrally formed structure, or an assembled structure formed by splicing multiple parts together. For example, in this embodiment, the first tube body 1411 and the bypass tube body 1413 can be integrally formed to form a "T"-shaped structure, and the peripheral wall of the second tube body 1412 is convexly provided with a joint that is plugged into and matched with the end of the bypass tube body 1413.

[0042] When the flow valve 14 is opened, the bypass flow channel is connected, so that the water inlet pipe 12, the heat exchanger 11, the water outlet pipe 13 and the valve body 141 are connected to form a circulation loop. Among them, the control component 142 is used to control the water flow through the bypass flow channel of the valve body 141. Specifically, it can be controlled by the control component 142 (such as a solenoid valve) to control the on and off of the bypass flow channel of the valve body 141 to achieve switching between flow and no flow; it can also be adjusted by the control component 142 (such as a proportional valve) The flow cross-sectional size of the bypass flow channel of the valve body 141 is adjusted to achieve flow size adjustment (for example, switching between flow gears such as large flow, medium flow, small flow, and no flow). The circulating water pump 15 is arranged in the circulation loop to drive the water flow along the circulation loop. Among them, the circulating water pump 15 can be arranged in the water inlet pipe 12 or the water outlet pipe 13. Considering that the temperature of the water outlet pipe 13 is usually high, which may easily cause the surface temperature of the circulating water pump 15 to rise too high and affect the service life, the circulating water pump 15 may be optionally arranged in the water inlet pipe 12 to extend the service life of the circulating water pump 15 .

[0043] The following mainly describes the working process of the water heater 100 with the above-mentioned heat exchange system 10 in different application scenarios by examples.

[0044] When the water heater 100 is in a low-temperature and severe cold environment, the water heater 100 starts in the self-circulation mode, the flow valve 14 of the heat exchange system 10 opens, and the circulating water pump 15 starts. The circulating water pump 15 drives the water to circulate in the circulation loop of the heat exchange system 10, and at the same time, the burner 30 of the water heater 100 ignites and burns to heat the water in the circulation loop. In this way, the water in the circulation loop will be quickly heated, thereby playing a role in preventing the water path components of the water heater 100 from freezing. Compared with the prior art (such as Figure 1 As for the solution of achieving antifreeze through an external circulation pipeline (shown in FIG. 1 ), in this solution, the circulation loop of the heat exchange system 10 is built into the water heater 100, and the total length of the circulation loop is greatly reduced, so that the water content in the self-circulation path is much smaller than the water content in the external circulation pipeline. Therefore, the operating time required for the burner 30 to start once to achieve the purpose of antifreeze is shorter, the gas consumption is lower, the antifreeze is more efficient, and the time that the antifreeze operation of the water heater 100 causes interference to the user is greatly shortened. In addition, this antifreeze solution is also applicable to users who do not install a return valve, reducing the installation and use costs.

[0045] When the water heater 100 is in the water-off-and-on scenario, the water heater 100 self-circulation mode is started, and the water in the heat exchanger 11 flows out of the heat exchanger 11 under the action of self-circulation, and no longer continuously absorbs the residual heat in the cavity, which can effectively reduce the "hot feeling" when it is turned on again; at the same time, after starting the self-circulation, the burner 30 is started to heat the water in the circulation loop. During the self-inspection and pre-cleaning sequence of the secondary water heater 100, the first water to flow out is the water heated by the self-circulation of the water inlet flow path and combustion, rather than the unheated cold water, so the "cold feeling" of the secondary water can be effectively reduced. In this way, the problem of water temperature fluctuation in the water-off-and-on scenario can be well solved, avoiding the "hot feeling" and "cold feeling" of users during bathing, which can improve the user experience.

[0046] In addition, when the water heater 100 is working normally in a non-bathing scenario, the bypass flow channel can also be closed through the control component 142. At this time, the highest temperature in the heat exchange tube of the heat exchanger 11 is the set temperature of the water heater 100. In this way, the risk of vaporization noise can be greatly reduced, and the thermal efficiency of the heat exchanger 11 will not be affected. The service life of the heat exchanger 11 can also be extended.

[0047] like Figure 3As shown, in one embodiment, the heat exchange system 10 further includes a heating element 16 disposed on the circulation loop, and the heating element 16 is used to heat the water flow in the circulation loop. In the self-circulation mode, the heating element 16 can be started to heat the water flow at the same time, which can improve the heating efficiency. Among them, the heating element 16 includes but is not limited to heating by means of electric heating or heat storage heating. Optionally, the heating element 16 is an electric heater. In the non-water use period (for example, in the early morning) in the severe cold environment in winter, the heating element 16 can be started to replace the burner 30 to heat the water in the circulation loop. On the basis of solving the problem of antifreeze of the water path components of the water heater 100, the burner 30 can also be prevented from burning and generating noise, thereby avoiding affecting the user's rest. In the scenario of turning off the water and then turning it on again, the heating element 16 is used to heat the water flow instead of the burner 30 during self-circulation heating. In the case of solving the water temperature fluctuation, the burner 30 can also be prevented from burning and generating noise, thereby avoiding affecting the user's rest.

[0048] Furthermore, the heating element 16 includes an electric heater disposed on the water inlet pipe 12 of the circulation loop. The electric heater may be a heating tube connected in series to the water inlet pipe 12, or may be an electric heating wire wound around the water inlet pipe 12, or may be an electric heating film coated on the peripheral wall of the water inlet pipe 12. Since the temperature of the water inlet pipe 12 of the circulation loop is relatively low and the temperature of the water outlet pipe 13 is relatively high, the electric heater is disposed on the water inlet pipe 12 with a relatively low temperature, which can avoid excessive temperature rise on the surface of the electric heater and extend the service life of the electric heater. Moreover, only a relatively low-power electric heater is required to heat the low-temperature water in the water inlet pipe 12, which can improve the heating efficiency.

[0049] Among them, the control component 142 can be a solenoid valve or a proportional valve. For example, in one embodiment, the control component 142 is a solenoid valve, and specifically a normally closed solenoid valve can be used. When the water heater 100 starts the self-circulation mode, the solenoid valve opens and the circulation loop is connected. The solenoid valve is used to control the on-off of the bypass flow channel, so that the bypass flow channel can be switched between two gears with bypass flow and without bypass flow, and the adjustment is simple and convenient, and the response speed is fast. For example, in another embodiment, the control component 142 can use a proportional valve, and the proportional valve is equipped with a stepping motor to achieve continuous stepless adjustment, with higher adjustment accuracy, which can not only realize the on-off control of the bypass flow channel, but also realize the flow size adjustment of the bypass flow channel.

[0050] like Figure 8 As shown, optionally, the control component 142 is arranged on the peripheral wall of the bypass tube body 1413 and is located between the first tube body 1411 and the second tube body 1412. In this way, the cavity area constructed by the valve body 141 itself can be fully utilized to accommodate the control component 142, thereby improving space utilization, reducing the overall volume of the flow valve 14, and facilitating the miniaturization of the volume of the flow valve 14.

[0051] Optionally, the axis of the first tube body 1411, the center line of the control component 142, and the axis of the second tube body 1412 are parallel to each other, and the distance between the center line of the control component 142 and the axis of the first tube body 1411 is smaller than the distance between the center line of the control component 142 and the axis of the second tube body 1412. In this way, the control component 142 can be arranged closer to the first tube body 1411, and farther from the second tube body 1412. In the heat exchange system 10, the first tube body 1411 is used to transport cold water, and the second tube body 1412 is used to transport hot water. The control component 142 can be arranged away from the hot water pipe (that is, the second tube body 1412) to avoid damage to the control component 142 by the heat radiated by the hot water pipe. At the same time, the control component 142 is arranged closer to the cold water pipe (that is, the first tube body 1411), which is conducive to heat dissipation of the control component 142, thereby extending the service life of the control component 142.

[0052] like Figure 4 and Figure 8 As shown, in one embodiment, the water inlet pipe 12 includes a first water inlet pipe section 121 connecting the water inlet end of the first tube body 1411 with the water inlet joint 60, and a second water inlet pipe section 122 connecting the water outlet end of the first tube body 1411 with the water inlet of the heat exchanger 11; the water outlet pipe 13 includes a first water outlet pipe section 131 connecting the water inlet end of the second tube body 1412 with the water outlet of the heat exchanger 11, and a second water outlet pipe section 132 connecting the water outlet end of the second tube body 1412 with the water outlet joint 70; the first tube body 1411, the second water inlet pipe section 122, the heat exchanger 11, the first water outlet pipe section 131, the second tube body 1412, and the bypass tube body 1413 are connected end to end to form the circulation loop.

[0053] The bottom wall of the shell 20 of the water heater 100 is usually provided with a water inlet joint 60 for delivering cold water, a water outlet joint 70 for outputting hot water, and a gas inlet joint 80 for delivering gas to the burner 30. The first tube body 1411 is connected in series between the first water inlet pipe section 121 and the second water inlet pipe section 122 of the water inlet pipe 12, and the second tube body 1412 is connected in series between the first water outlet pipe section 131 and the second water outlet pipe section 132 of the water outlet pipe 13. Thus, when the heat exchange system is applied to the water heater 100, the water inlet joint 60, the first water inlet pipe section 121, the first pipe body 1411, the second water inlet pipe section 122 and the water inlet of the heat exchanger 11 are connected in sequence to form a water inlet pipe 12 for delivering cold water to the heat exchanger 11; the water outlet of the heat exchanger 11, the first water outlet pipe section 131, the second pipe body 1412, the second water outlet pipe section 132 and the water outlet joint 70 are connected in sequence to form a water outlet pipe 13 for outputting hot water in the heat exchanger 11. In this embodiment, the first pipe body 1411, the second water inlet pipe section 122, the heat exchanger 11, the first water outlet pipe section 131, the second pipe body 1412 and the bypass pipe body 1413 are connected end to end to form a circulation loop, and the valve body 141 is connected in series to the middle position of the water inlet pipe 12 and the water outlet pipe 13, which can shorten the total length of the circulation loop and improve the heating efficiency in the self-circulation mode.

[0054] Optionally, the flow valve 14 , the second water inlet pipe section 122 , the first water outlet pipe section 131 , and the water inlet and water outlet of the heat exchanger 11 are all located on the same side of the heat exchanger 11 .

[0055] In this embodiment, the water inlet and the water outlet of the heat exchanger 11 are located on the same side of the water heater 100, for example, the water inlet and the water outlet can be arranged on the right end plate of the heat exchanger 11. One end of the second water inlet pipe section 122 is connected to the water inlet, and the other end is extended downwardly, one end of the first water outlet pipe section 131 is connected to the water outlet, and the other end is extended downwardly, and the flow valve 14 is connected to the bottom ends of the second water inlet pipe section 122 and the first water outlet pipe section 131; in this way, the second water inlet pipe section 122, the first water outlet pipe section 131 and the flow valve 14 are also located in the right side space of the heat exchanger 11, so that the layout of the entire circulation loop is more compact, which is conducive to making full use of the space between the heat exchanger 11 and the side wall of the shell 20, and is conducive to the miniaturization of the volume of the water heater 100. In addition, it is also conducive to further shortening the total length of the circulation loop and improving the heating efficiency in the self-circulation mode.

[0056] In addition, the water inlet and water outlet of the heat exchanger of the traditional water heater are usually located on both sides of the heat exchanger, and accordingly, the water inlet pipe and the water outlet pipe need to be placed on both sides of the heat exchanger, which not only takes up a large space, but also when the bypass mixing function needs to be realized, a longer bypass pipe needs to be connected between the water inlet pipe and the water outlet pipe. Since the bypass pipe is long, the bypass response time will be prolonged, affecting the performance of the water heater. In this embodiment, the flow valve 14, the second water inlet pipe section 122, the first water outlet pipe section 131, and the water inlet and water outlet of the heat exchanger 11 are all located on the same side of the heat exchanger 11, so that the distance between the second water inlet pipe section 122 and the first water inlet pipe section 121 is relatively small. In this way, the connection between the first water inlet pipe section 121 and the second water inlet pipe section 122 can be realized through the smaller size of the flow valve 14. At the same time, it is also helpful to shorten the length of the bypass flow channel of the flow valve 14, so that the cold water in the first tube body 1411 can be quickly transported to the second tube body 1412 through the shorter bypass flow channel to mix with the hot water in the second tube body 1412, thereby ensuring a faster bypass response speed and a more accurate bypass ratio. In addition, the shortened length of the bypass tube body 1413 is helpful to improve the structural stability of the entire valve body 141, and avoid deformation of the bypass tube body 1413 after long-term use, which has an adverse effect on the bypass ratio and bypass response speed.

[0057] It can be understood that in the above embodiment, the first tube body 1411 is connected in series to the middle part of the water inlet pipe 12, and the second tube body 1412 is connected in series to the middle part of the water outlet pipe 13, so that the two ends of the first tube body 1411 need to be assembled and connected with the first water inlet pipe section 121 and the second water inlet pipe section 122 respectively, and the two ends of the second tube body 1412 need to be assembled and connected with the first water outlet pipe section 131 and the second water outlet pipe section 132 respectively. When applied to the water heater 100, it is also necessary to assemble and connect the first water inlet pipe section 121 with the water inlet connector 60, and assemble and connect the second water outlet pipe section 132 with the water outlet connector 70. In this way, multiple assembly locations are formed on the water inlet pipe 12 and the water outlet pipe 13 of the water heater 100, which not only affects the assembly efficiency, but also the sealing of the assembly locations cannot be guaranteed, which will produce more leakage points and have a greater risk of leakage.

[0058] In order to improve the assembly efficiency of the water inlet pipe 12 and the water outlet pipe 13, improve the sealing reliability, and reduce the risk of water leakage, in one embodiment, the first tube body 1411 is connected to the water inlet end of the water inlet pipe 12, and the second tube body 1412 is connected to the water outlet end of the water outlet pipe 13. The water inlet end of the first tube body 1411 is provided with a water inlet joint 60, and the water outlet end of the second tube body 1412 is provided with a water outlet joint 70. In this way, when in use, it is only necessary to assemble the first tube body 1411 with the water inlet end of the water inlet pipe 12, and assemble the second tube body 1412 with the water outlet end of the water outlet pipe 13. When applied to the water heater 100, the water inlet joint 60 of the water inlet end of the first tube body 1411 is extended out of the bottom wall of the shell 20, so that it can be connected to the external water inlet pipe 12, and the water outlet joint 70 of the water outlet end of the first tube body 1411 is extended out of the bottom wall of the shell 20, so that it can be connected to the external water outlet pipe 13.

[0059] like Figures 4 to 7 As shown, the utility model also proposes a water heater 100, including a housing 20 and a heat exchange system 10 disposed in the housing 20. The specific structure of the heat exchange system 10 refers to the above embodiment. Since the water heater 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the water heater 100 includes but is not limited to a forced extraction type gas water heater 100 or a forced drum type gas water heater 100.

[0060] The water heater 100 includes a housing 20, and a heat exchange system 10, a burner 30, a smoke hood 40, and a fan 50 arranged in the housing 20. Among them, the burner 30 is arranged below the heat exchanger 11 of the heat exchange system 10. When the water heater 100 is working, the fan 50 is started, and the mixture of gas and air enters the burner 30 for combustion. The cold water in the external water supply system can enter the heat exchanger 11 of the heat exchange system 10 through the water inlet pipe 12. The high-temperature flue gas generated by the burner 30 flows upward to exchange heat with the heat exchange system 10 to heat the water in the heat exchanger 11. The heated hot water can be output to the user end through the water outlet pipe 13 to provide hot water for the user. The burner 30, the circulating water pump 15 and the control component 142 of the flow valve 14 are electrically connected to the control system of the water heater 100. The control system issues corresponding control instructions to the circulating water pump 15, the burner 30 and the control component 142 according to the working state of the water heater 100 to be suitable for different application scenarios.

[0061] like Figure 4 and Figure 5As shown, in some embodiments, the water heater 100 is a forced exhaust gas water heater 100. The housing 20 is provided with a heat exchange system 10, a burner 30, a smoke hood 40 and a fan 50. The burner 30 and the smoke hood 40 are respectively arranged on opposite sides of the heat exchanger 11 of the heat exchange system 10; the fan 50 is a forced exhaust fan 50 connected to the smoke hood 40. For example, in the height direction of the water heater 100, the smoke hood 40, the heat exchanger 11, and the burner 30 are arranged in sequence from top to bottom, and the fan 50 is arranged on one side of the smoke hood 40. The air inlet of the fan 50 is connected to the smoke hood 40, and the air outlet of the fan 50 is connected to the smoke exhaust pipe. When the water heater 100 is working, negative pressure is generated at the air inlet of the fan 50, so that the high-temperature flue gas generated by the burner 30 can flow upward, exchange heat with the heat exchanger 11, and then be sucked into the smoke hood 40, and finally discharged from the exhaust pipe through the fan 50.

[0062] like Figure 6 and Figure 7 As shown, in other embodiments, the water heater 100 is a strong extraction type gas water heater 100. The housing 20 is provided with a heat exchange system 10, a burner 30, a smoke hood 40 and a fan 50, the burner 30 and the smoke hood 40 are respectively arranged on opposite sides of the heat exchanger 11 of the heat exchange system 10; the fan 50 is a strong blower 50 connected to the burner 30. For example, in the height direction of the water heater 100, the smoke hood 40, the heat exchanger 11, the burner 30 and the fan 50 are arranged in sequence, the air outlet of the fan 50 is connected to the burner 30, and a smoke exhaust pipe is provided on the top of the smoke hood 40. When the water heater 100 is working, the fan 50 can be used to blow air into the burner 30 to achieve secondary air replenishment to ensure sufficient combustion. The fan 50 can also drive the high-temperature flue gas generated by the burner 30 to flow upward, exchange heat with the heat exchanger 11, and then be sucked into the smoke hood 40, and finally discharged through the smoke exhaust pipe.

[0063] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchange system, used to be arranged inside a water heater, characterized in that: include: A heat exchanger, wherein the heat exchanger is connected with a water inlet pipe and a water outlet pipe; A flow valve, comprising a valve body and a control component provided on the valve body, wherein the valve body comprises a first pipe body connected to the water inlet pipe, a second pipe body connected to the water outlet pipe, and a bypass pipe body connecting the first pipe body with the second pipe body, and the control component is used to control the water flow rate of the bypass pipe body; the water inlet pipe, the heat exchanger, the water outlet pipe and the valve body are connected to form a circulation loop; and A circulating water pump is arranged in the circulating loop and is used to drive water to flow along the circulating loop.

2. The heat exchange system according to claim 1, characterized in that: It also includes a heating element arranged on the circulation loop, and the heating element is used to heat the water flow in the circulation loop.

3. The heat exchange system according to claim 2, characterized in that: The heating element comprises an electric heater arranged on the water inlet pipe of the circulation loop.

4. The heat exchange system according to claim 1, characterized in that: The control component is a solenoid valve or a proportional valve.

5. The heat exchange system according to claim 1, characterized in that: The control component is arranged on the peripheral wall of the bypass tube body and is located between the first tube body and the second tube body.

6. The heat exchange system according to any one of claims 1 to 5, characterized in that: The water inlet pipe includes a first water inlet pipe section connecting the water inlet end of the first pipe body with the water inlet joint, and a second water inlet pipe section connecting the water outlet end of the first pipe body with the water inlet of the heat exchanger; the water outlet pipe includes a first water outlet pipe section connecting the water inlet end of the second pipe body with the water outlet of the heat exchanger, and a second water outlet pipe section connecting the water outlet end of the second pipe body with the water outlet joint; the first pipe body, the second water inlet pipe section, the heat exchanger, the first water outlet pipe section, the second pipe body, and the bypass pipe body are connected end to end to form the circulation loop.

7. The heat exchange system according to claim 6, characterized in that: The flow valve, the second water inlet pipe section, and the first water outlet pipe section are all located on the same side of the heat exchanger.

8. The heat exchange system according to any one of claims 1 to 5, characterized in that: The first tube body is connected to the water inlet end of the water inlet pipe, the second tube body is connected to the water outlet end of the water outlet pipe, the water inlet end of the first tube body is provided with a water inlet joint, and the water outlet end of the second tube body is provided with a water outlet joint.

9. A water heater, characterized in that: The invention comprises a shell and a heat exchange system according to any one of claims 1 to 8 arranged in the shell.

10. The water heater according to claim 9, characterized in that A burner, a smoke hood and a fan are arranged in the shell, and the burner and the smoke hood are respectively arranged on opposite sides of the heat exchanger; wherein the fan is a strong exhaust fan connected to the smoke hood; or the fan is a strong blower connected to the burner.

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